There is more module, and the bottom one has separation wall.
Actually, if you check this photo, you will see that this wall goes beyond the bottom one. I dont think that that box could be inserted there.
And what else can be the purpose of those modules at the up left corner of the area ?
To build the ship.
Also, it appears that there are now 3 smaller cranes operational, instead of only one (the bases of the other 2 were already there).
Actually it seems that there are only 2 smaller cranes up in the air. The other actually seems to be the smaller horizontal crane.